Heat pumps provide both heating and cooling — when they fail, they take both functions offline. Local contractors diagnose and repair heat pump systems across Dover and Stewart County year-round.
Dover is the Stewart County seat and sits at the edge of the Land Between the Lakes region, close enough to Kentucky Lake that lake tourism and seasonal or second homes are a real part of the local housing mix alongside year-round residences. The town carries real Civil War history -- Fort Donelson, just outside town, was the site of a major 1862 Union victory that opened the Cumberland River to federal gunboats, and the battlefield is now a National Battlefield park that draws visitors through the area. Away from the lake, Stewart County is rural and thinly populated compared to Montgomery County next door, with a housing stock that leans older: farmhouses and modest homes built well before central air was standard, often retrofitted with window units or ductless systems rather than a full central system, plus a scattering of newer construction near the lake and along the main highways into town. Rural Stewart County homes are also more likely to be on well water and septic systems and sit further from the nearest contractor's shop, which makes response time and diagnosing correctly on the first visit matter more than it does inside Clarksville proper.
Heat Pump Problems We Fix
Common heat pump failures include reversing valve problems that prevent the system from switching between heating and cooling modes, refrigerant leaks, defrost board failures that cause ice buildup on the outdoor unit, compressor issues, and auxiliary heat problems. Heat pump diagnostics require specialized knowledge of the refrigerant cycle in both directions.
System runs constantly but never quite reaches the set temperature
This often points to a refrigerant or airflow issue rather than a thermostat problem — a technician can check charge levels and airflow before assuming the system itself is undersized.
Outdoor unit is covered in ice, even when it's not especially cold out
Some frost during a normal defrost cycle is expected, but heavy ongoing ice buildup usually means the defrost cycle isn't completing correctly or airflow is restricted.
Noticeably higher electric bills with no change in usage habits
A system working harder than it should to hit the same comfort level is a common early sign of a developing mechanical issue, often before anything sounds or feels obviously wrong.
Heat Pump vs. Furnace in Middle Tennessee
In Middle Tennessee's climate, heat pumps are efficient down to certain outdoor temperatures, after which auxiliary or emergency heat takes over. If your heat pump is running but not keeping up in cold weather, the issue may be with the auxiliary heat source rather than the heat pump itself. The technician checks the full system.
- A summer repair does not verify the heating side. The reversing valve, defrost control, and auxiliary heat are not exercised in cooling mode and can only be tested under heating conditions.
- A heating repair does not confirm the cooling side either, for the same reason in reverse.
- Repair restores the equipment's rated capacity; it does not compensate for ductwork or insulation that limits what reaches the rooms.
- Auxiliary heat operating on the coldest nights is designed behaviour, not a defect to be repaired out of the system.
- Because both modes run through the same equipment, a fault deferred in one season is usually still waiting in the next, which is the practical argument for testing both modes at a single visit.
This content is reviewed by the Clarksville HVAC Repairs editorial team and informed by licensed-contractor sourcing, manufacturer documentation, and established industry standards for hvac repair. Read our editorial standards.